body {
    font-family: "Trebuchet MS", Arial, Helvetica, sans-serif, cursive;
    font-size: 10px;
    background:url(/img/bg.jpg) no-repeat center center fixed;
    text-align: center;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    width:100%;
}